Fehlertolerierende Rechensysteme: 2. GI/NTG/GMR-Fachtagung / by P. Corsini, L. Simoncini, L. Strigini (auth.), K.-E.

By P. Corsini, L. Simoncini, L. Strigini (auth.), K.-E. Großpietsch, M. Dal Cin (eds.)

In the decade of machine technology improvement, we will be able to discover a transforming into curiosity in fault-tolerant computing. This curiosity is the results of a emerging variety of appl'ications the place trustworthy operation of computing platforms is a vital requirement. in addition to simple learn within the box of fault-tolerant computing, there's an expanding num­ ber of platforms in particular designed to accomplish fault-tolerance. it's the goal of this convention to provide a survey of current learn and improvement actions in those components. the second one GI/NTG/GM~ convention on Fault-Tolerant Computing structures has had a preparatory time of approximately years. In March 1982, the 1st GI convention relating fault-tolerant computing structures was once held in Munich. one of many result of the convention used to be to deliver an organiza­ tional framework to the FTC neighborhood in Germany. This resulted in the founding of the typical curiosity team "Fault-Tolerant Computing platforms" of the Gesellschaft fur Informatik (GI), the Nachrichtentechnische Gesellschaft (NTG), and the Gesellschaft fur MeB- und Regelungstechnik (VDI/VDE-GMR) in November 1982. at the moment, it used to be additionally determined to time table a biannual convention on fault-tolerant computing platforms. one of many ambitions of this moment convention is to bolster the family with the overseas FTC neighborhood; hence, the decision for papers was once prolonged not just to German-speaking nations, yet to different nations as well.

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Extra info for Fehlertolerierende Rechensysteme: 2. GI/NTG/GMR-Fachtagung / Fault-Tolerant Computing Systems 2nd GI/NTG/GMR Conference / Bonn, 19.–21. September 1984

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A /c-resilient object must reside at more than k sites to guarantee that after k site failures there is still at least one more site at which a component of the object provides access to data and is able to continue execution. Consistency of the copies of the object data is ensured by using techniques developed for distributed data bases (Ber83)[Ske81). Operations on resilient objects can be executed concurrently. , they are serialized with respect to each other. In contrast to traditional data base environments, information about the structure of data, objects, and about the semantics of operations is available in the ISIS environment.

4 Executing a type specific operation on an object (example) Now we consider the execution of a type specific operation on an object (Fig. 4). We assume that part of the type object is a template associated to each operation. This template determines a set of dependencies between the object in question and the formal parameters of the operation. Executing the operation on a concrete object with actual parameters results in generating dependencies between the corresponding object activities according to the template.

For instance, in the case of two-phase locking, locks only may be set (objects only may be included) in the first phase before the lock point is reached. Afterwards, locks may only be freed (only releasing objects is permitted). Thus, it may be appropriate to include objects before they are actually needed in order to reach the lock point which allows for releasing other objects. In applying two-phase locking to nested atomic actions, releasing an object from a nested atomic action to the global level must be delayed until the outer atomic actions reach their lock points.

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